| The concern we have with this compromise is that with applications allowed to auto-elevate from user to administrator, it creates a potential local privilege escalation exploit. For Beta 1, a proof of concept exploit was put together that used rundll32 to disable UAC entirely without informing the user or requiring their intervention. In return Microsoft removed the UAC control panel from the auto-elevating list so that any direct attempts to manipulate it still require user intervention. This blocked the proof of concept exploit while maintaining all the other benefits of Level 2 UAC. It should be noted however that similar exploits could still work with Level 1, as it’s Level 2 without the secure desktop screen (thereby allowing apps to fake pressing the Allow button). |
| Disk Defragmenter is now also capable of recognizing SSDs, and will block the defragmentation of those disks since defragmenting is of no use due to wear-leveling algorithms. |
| The other big trick as a result of WDDM 1.1 is that support for heterogeneous display drivers has returned. With WDDM 1.0 and its homogenous driver requirement, computers were limited to using video cards that would work with a single driver – in turn limiting a computer to video cards from a single vendor. With heterogeneous driver support, computers are once again free to use non-matching video cards, so long as they have a WDDM 1.1 driver. |
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